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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [sun/] [reflect/] [misc/] [ReflectUtil.java] - Blame information for rev 763

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1 763 jeremybenn
/* ReflectUtil.java - JSR 166 reflection hooks
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   Copyright (C) 2006 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING.  If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library.  Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module.  An independent module is a module which is not derived from
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or based on this library.  If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so.  If you do not wish to do so, delete this
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exception statement from your version. */
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package sun.reflect.misc;
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import java.lang.reflect.Modifier;
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public class ReflectUtil
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{
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  // We use this inaccessible inner class as an argument type
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  // in verifyMemberAccess.  All current users of this method
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  // in the JSR 166 RI pass 'null' for this argument, and
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  // consequently we don't know what it means.  Using a funny
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  // type like this for the argument means that if the RI changes,
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  // we will see a compilation error.
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  private static class MustBeNull
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  {
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  }
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  /**
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   * Check if the current thread is allowed to access the package of
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   * the declaringClass.
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   *
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   * @param declaringClass class name to check access to
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   * @throws SecurityException if permission is denied
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   * @throws NullPointerException if declaringClass is null
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   */
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  public static void checkPackageAccess(Class declaringClass)
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  {
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    SecurityManager sm;
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    if ((sm = System.getSecurityManager()) != null)
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      {
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        while (declaringClass.isArray())
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          declaringClass = declaringClass.getComponentType();
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        String name = declaringClass.getName();
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        int i = name.lastIndexOf('.');
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        if (i != -1) // if declaringClass is a member of a package
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          {
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            name = name.substring(0, i);
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            sm.checkPackageAccess(name);
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          }
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      }
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  }
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  /**
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   * Perform access checks on a member of a class.  This API is
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   * derived from the public domain code in the JSR 166 reference
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   * implementation.
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   * @param caller the class requesting access to the member
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   * @param declarer the declaring class of the member
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   * @param ignored unknown parameter; always null
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   * @param modifiers the modifiers on the member
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   * @return true if access is granted, false otherwise
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   */
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  public static void ensureMemberAccess(Class caller,
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                                        Class declarer,
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                                        MustBeNull ignored,
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                                        int modifiers)
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  {
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    // Same class, always ok.
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    if (caller == declarer)
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      return;
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    // Public access is ok.
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    if ((modifiers & Modifier.PUBLIC) != 0)
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      return;
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    // Protected access and request comes from
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    // a subclass of the declarer -- ok.
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    if ((modifiers & Modifier.PROTECTED) != 0
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        && declarer.isAssignableFrom(caller))
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      return;
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    // Package-private access, or protected access,
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    // and the packages are the same --ok.
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    if ((modifiers & Modifier.PRIVATE) == 0
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        && caller.getPackage() == declarer.getPackage())
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      return;
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    // Otherwise, no.
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    throw new IllegalAccessError();
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  }
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}

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